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IO Performance inside VE [message #30258] Mon, 19 May 2008 09:40 Go to next message
ebasley is currently offline  ebasley
Messages: 14
Registered: February 2008
Junior Member
We're using Debian kernel 2.6.18-fza-028stab053.5-686

When we compare local disk write performance between HN and VE, we can notice 40% performance less in the last case.


Test :

//from HN

# time yes "Bonjour ici les bidibules"> /var/lib/vz/private/105/tmp
gives 4 472 987 lines/seconds

// from VE
# vzctl enter 105
# time yes "Bonjour ici les bidibules"> /tmp
gives 2 656 845 lines/seconds

Inside the same VE NFS write performance is better than local disk access (3 648 706 lines/s) !!

An idea ?

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Re: IO Performance inside VE [message #30273 is a reply to message #30258] Mon, 19 May 2008 13:19 Go to previous messageGo to next message
maratrus is currently offline  maratrus
Messages: 1495
Registered: August 2007
Location: Moscow
Senior Member
Hello,

could you possibly explain in more detail how did you measure that speed and how many experiments did you conduct?

Thank You!

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Re: IO Performance inside VE [message #30276 is a reply to message #30258] Mon, 19 May 2008 15:01 Go to previous messageGo to next message
jergendutch is currently offline  jergendutch
Messages: 16
Registered: April 2008
Junior Member
That is more like a cpu test. Do this:

time head --bytes=1000m /dev/zero > OUT

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Re: IO Performance inside VE [message #30317 is a reply to message #30276] Wed, 21 May 2008 07:46 Go to previous messageGo to next message
maratrus is currently offline  maratrus
Messages: 1495
Registered: August 2007
Location: Moscow
Senior Member
Hi,

please show the results of the last command on the HN and inside CT.

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Re: IO Performance inside VE [message #30318 is a reply to message #30317] Wed, 21 May 2008 07:55 Go to previous message
ebasley is currently offline  ebasley
Messages: 14
Registered: February 2008
Junior Member
You are right, our tests where more cpu oriented than IO.
We tested with the last command, and found same results between HN and VE. And this time nfs test is 10 times slower than local disks : sounds better !





Thanks for your help.

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